Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3d5376c61d19fe…

MALICIOUS

PDF

48.2 KB Created: 2020-08-26 04:39:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a62eb5ecffa4d826a6ee46f8a4493fa SHA-1: 35d11506e06052318749d17a786dc3017dc12d06 SHA-256: 0a3d5376c61d19fe98f39c9ed7ec806885961eb1991401175e2185270da9f97c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=2007+volkswagen+passat+2.+0+t+wagon
    • http://files.thefineryboutique.com/uploads/1/3/1/4/131438874/72ba8d090.pdf
    • http://files.crimsonrichdesire.co.uk/uploads/1/3/1/6/131606670/zuvute.pdf
    • http://lubuso.concealedwindowtinting.com/uploads/1/3/0/8/130873951/posotuviwurezo.pdf
    • http://xipop.dentalexplorations.org/uploads/1/3/2/6/132681218/9523d86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8119/3885/files/ms_sql_server_developer_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/tekunufubawetofil.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/musepoxoposuvupevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/vitupivisijunapovega.pdf
    • https://cdn.shopify.com/s/files/1/0452/3973/0336/files/free_african_history_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0430/5338/3833/files/52401691248.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/rupapiselubenofenamedi.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/greenberg_classification_of_african_languages.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/luzaxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/latukutolotomet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3704/files/kapiwenebugotezevofep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d02.bin
c0a3111852aac5871c5fd19e7370048ecdd7a6a79edc719cba2b2a15cf3c8573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D02 5140 bytes
font_01_sfnt_off00007ea9.bin
2614cebcb572a78256455b6fdd925ea7be23cee28ca9aaeace88466f7a545563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA9 11460 bytes
font_02_sfnt_off0000a403.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA403 4324 bytes

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